Reports

Low-resolution real-space envelopes: an approach to the ab initio macromolecular phase problem

Science  05 Apr 1991:
Vol. 252, Issue 5002, pp. 128-133
DOI: 10.1126/science.2011749

Abstract

An ab initio approach to the phase problem in macromolecular x-ray crystallography is described. A random gas of hard-sphere point scatterers is allowed to condense under the constraint of the solvent fraction and the restraint of the observed Fourier amplitude data. Two applications to real macromolecular examples are discussed. This method produces an approximate outline of the bulk solvent regions and thus yields a low-resolution picture of the unit cell that can be extended to higher resolutions in special cases, such as through the use of molecular replacement or of noncrystallographic symmetry-based phase extension.

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